@Fabianno: Can you attach the plugin.xml or the Product itself? One point would be do check the complete plugins from the dependencies from your product. Try pressing Add required plugins, can sometimes help.

from the attached product definition, one major problem is that you are trying to export your product with a mix of different platform-specifc plugins (linux, win, mac, x86 & 64).
You should first reduce the plugins to the platform and window-system, you are tring to build on.
Later on, and if you are targeting multi-platform-builds, you are better setup (I would always suggest to do so) to use feature-projects, where you can explicitely define the target environment for each plugin.

Also it might be a good thing to complete the product settings, such as launcher icons, etc. as this could break the build as well. Use the eclipse-ide things as a test approach and modify this when you got it working to create your own product-branding.